Plane



April 5,1927.. 1,623,6ml

T. T. TVEDT PLANE Filed Dec. 5, 1922 A T ORNE YS vantages of v and appreciated by those skilled in the art. j

d and partly in vertical section illustrating a Patentedl Apr. '5, 1927. j

f THOMAS r. rvnnr, or BROOKLYN, new YORK.

rLANn.

Application `filed. December 5, 1922.` Serial No. 605,010.

' This invention-relates to planes and. more particularlyto planes of the general character disclosed in applicants application Serial Number 516,908, filed ,November `22, "1921.k The plane, shown and described in this ap-- plication comprisesa small thin blade mounted so that it maybe quickly and easily removed fromthe plane and discarded when it becomes dull and a sharp blade inserted in place thereof. j

One object of the present invention is .to produce a combination of `elements comprising a small thin `cutting blade which may be substituted as Aa unit for the ironin lanes at present in commercial use. n Another object ofthe invention is to provide anovel and'improved construction for clamping the` small thin blader-in position. lWith these and other objects in view the invention comprises the noveland improved constructions, arrangements and combinations of parts hereinafter described and particularly pointed out in the claims, the adwhich will be readily understood @The invention will be clearly understood from the accompanying drawings lillustrating the invention in its preferred form and the following detailed description of the constructions therein shown. f

In the drawingsc n d Fig. 1 is a view partly insideelevation plane embodying the invention;

Fig. 2 is a and inner 'clampingplate detached from the plane taken in the direction of the arrow a Fs- 1;

Fig. 3 is a detail perspective Vview illus-` trating the parts shownin Fig. 2;

Fig. 4 is a perspective view of the removable blade; and f Y j Fig. 5 isl a sectional View illust-rating a modified form of inner clamping plate.

In the embodiment of the invention illustrated in the drawing, the plane coinprises a stock .2fhaving/ the usual handle el and stud 6 to be grasped by the operator in operating the plane. The stock is formed with an opening 8 through which the blade projects below the lower surface of the stock and withl an inclined face 1() upon which the iron rests. n l

In theI preferred `form `of the invention detail view of the iron blade the Vbladeis mounted on the lower end of the iron and is secured thereto by a clamping plate so that iron, blade and clamping plate may be inserted in' and removed from the plane' as a unit. The blade consists of a relatively small thin somewhat flexible piece` of sheet steel preferably having at least two cutting edges and mounted in the planejso that it may be quickly and easily reversed or removed from the plane. Blades of this' character may be cheaply manufactured so.

that .they may be thrown away when they become dull thereby eliminating the necessity oi. grinding blades which, in the-ordinary plane, takes a greatj deal of'labor and time.`

In the construction shown, the iron is indicated at `12 and the blade at .14. This blade is provided with two cutting edges andy is mounted on the lower-end ofthe iron so thatthese edges may be placed alternatively in cutting position, the blades resting on the upper face of the iron as shown in Figs. 1 and 3. The blade, as stated above, is somewhat ilexible so that it requires support adjacent its `cutting edge. yThe blade is supported on itsl rear side adjacent its cutting edge by the forward end of the iron which extends comparatively close lto the cutting edge of the blade and the blade islocated in a. predetermined and definite position with relation to the forward end of the iron bykmeans of two pins 16 arranged to engage in openings 18 in the blades.

'Ihe blade is clamped in position on the iron preferably by means of a clamping plate 20 bearing at its forward end on. the

blade and secured to the iron bymea-ns of a screw 22 passing through a slot 24 in the ironfand threaded into the clamping plate loosening the holding screw 22. To prevent the blade from chattering when the plane is in use, the forwardcnd ofthe'clamping plate 2O is bowed as shown clearly in Figs. 1 and 3, the rearof the bowed portion of the 'plate engaging the blade adjacent its rear edge Aas shown in these figures.

The iron, blade and clamping plate Q of the present construction take the place of the usual iron with integral cutting edge. These parts are arranged to be adusted as a unit to adjust the blade with relation to the stock. The adjusting means comprises a lever 2G pivoted at 28 on the stock, the upper end of which lever is arranged to project through a slot in the clamping plate 20. The lower end of the lever Q6 engages in a groove in a manually adjustable n'ut 3l threaded on a stud 32 secured in the plane stock. The movement of the inner clamping plate produced by the movement of the nut 3l and lever :26 adjusts the iron, blade and inner clamping plate unit longitudinally with relation to the stock.

The iron, blade and inner clamping plate unit is held in adjusted position with relation to thestocl: by means of an outer clamping plate 34 secured to the stock by means of al scre'w 36 passing through a slot 37 in the plate 34, a slotk 38 in plate 2O and through the slot 24 in the iron and threaded into the stock. The clamping plate 34 is arranged to tilt about the head of the screw 36 in a plane substantially perpendicular to the plane of the iron and is curved in cross section so that it engages at its forward end the forward end of the inner clamping plate. The rear end of the outer clamping plate is adjusted outwardly to force the forward end thereof into clamping engagement with the inner clamping plate by means of a lever 39 pivoted at 40 on said plate and provided with a cam shaped bearing portion arranged to engage a spring plate 42 interposed between the lever and the inner clamping plate 20. This spring plate is secured at its lower end to the clamping plate 34 and, by its bearing against the clamping plate 20, yieldingly holds the iron, blade and Clamping plate in position when the pressure of the outer clamping plate 34 on the inner clamping plate is relieved by the actuation of the lever 39;

In Fig. 1 of the drawing, the parts are shown in operating position, the lever 39 having been operated to force the forward end of the clamping plate 34 into clamping engagement with the forward end of the inner clamping plate 20. The engagement of the outer clamping' plate 34 with the inner clamping plate not only holds the iron, blade, and inner clamping plate unit securely in position in the stock, but also' forces the inner clamping plate more firmly against tl e blade to clamp the blade securedly to the iron. The engagement of the inner clamping plate with both the forward and rear edges of the blade holds the blade in a rel1- able manner and obviates any tendency of the blade to tilt about the lower end of the iron when in use.

The construction shown in Fig. 5 differs from that shown in Figs. 1, 2 and 3 in that the inner clamping plate indicated at 4Q is made of a size substantially the san'ie as that of the bowed portion at the lower end of the clamping plate 20. The clamping plate 42 as shown in Fig. 5 is preferably made slightly less in width than the blade and is secured to the iron l2 by means of screws 44 passing through holes in the plate and the holes 18 in the blade and threaded into the iron. By reason of its bowed form in cross section the clamping plate 42 securely clamps the forward and rear edges of the blade against the iron.

rlhe plane construction above described, with the exception of vthe iron blade and inner clamping plate unit, is substantially the same as that of certain planes now in commercial use, this unit having been substituted for the iron of such planes.r lVhen it is desired to adjust this unit in the plane the lever 39 is actuated to relieve the pressure of the clamping plate 34 on the inner clamping plate' and the said unit may be then adjusted by turning the adjusting nut 31.

Vhen a blade becomes dull and it is desired to reverse or replace the saine, the lever 39 is actuated torelieve the pressure of the clamping plate 34 on the inner clamping plate and the clamping plate 34 is then removed, the slot 37 having an enlargement at one end to permit the head of screw 36 to pass therethrough. The iron, blade and inner clamping plate unit is then removed and the inner clamping plate and iron are dis connected by loosening t-he screw 22 and relatively manipulating the parts so that the head of the screw will pass through an enlargement in the slot Q4. The blade, it only one edge is dulled, may be reversed in position on the iron, or, if both edges are dulled, it may be discarded and a sharp blade substituted therefor. The change in the blade thus may be quickly and easily made and the blade is clamped securely in position when in use. Whichever form of inner clamping plate is employed, the blade is Supported adjacent its cutting edge on one side by the iron and on the other by the clamping plate.

When a blade having two cutting edges is employed the openings 1S are located cen trally of the blade so that eitheredge thereof may be located in a predetermined and definite position with relation to the iron by the engagement of the pins 1G in said openings.

Having explained the nature and object of the invention and having specifically described a construction embodying the invention in its preferred form, what is claimed is The combination of a bench plane iron, clamp plate and small thin bit or blade; the clamping plate having a bowed front clamping portion of such width relative to the bit bit and iron having inter-engaging piris and 01- blade that'when its lfront edge engages openings to properly locate its edge to be said bit near the cutting edge in the cutting clamped. 10

`- position of the latter, the other `side of the Signed at New York, N. Y., this 2nd day bowed portion engages the bit adjacent the of December, 1922.

rear edge so 'that the bit is resiliently eiemped eed heid edjeeene beth edges, ehel THoMAsmTVEDT. 

